Today I was cleaning out my trailer (AKA workshop), it was LONG overdue!  I found tons of boxes to throw away but noticed one unopened.  There were four rolls of foam in there!! How in the world did I forget about them?  And they were shrink wrapped and marked "Open within 24 hours" and of course I had not.  They are hanging up and I'm hoping they will still be good.  But mostly I can't believe I forgot about them!

Nice!  Maybe I should clean my shop!

I bet they'll be fine. I've had foam stuffed in boxes or rolled up for extended lengths of time before and they have been fine. Just take more time to flatten out and lose creases.